Disappearing Forwarding Accounts?

So I had a client calling me confused as to why all his forwarding accounts have disappeared. I took a look at it and tried to add an entry.

Nothing.

If I check out /etc/valiases/thedomain.com I can see that it is empty. If I manually add to the forwarding file. It appears to work. If another entry is added, it'll just overwrite the file with just a blank file.

Anyone else experiencing this? Everything was working great and then bam.